The objective of this module is to efficiently reduce energy consumption and to increase solar energy production in cities while minimizing total greenhouse gas (GHG) emissions. The research includes the development of holistic, multi-scale and interdisciplinary approaches for assessing large scale deployment of (building integrated) photovoltaic in realistic urban contexts under different climatic, socio-economic and architectural conditions. Zurich and Singapore are used as complementary case studies and we are interacting with public stakeholders and agencies to directly apply research into practice by receiving feedback and providing training on toolboxes developed.